Bump Microsoft.AspNetCore.OpenApi from 10.0.0 to 10.0.3

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 10.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0" />
 
     <!-- API / Web -->
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.3" />
     <PackageVersion Include="Scalar.AspNetCore" Version="2.1.4" />
 
     <!-- MCP Server (Model Context Protocol — Copilot agent mode tools) -->